juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/ApplicationConfiguration.java

   1 package de.juplo.kafka;
   2
   3 import org.apache.kafka.clients.consumer.ConsumerRecord;
   4 import org.apache.kafka.common.TopicPartition;
   5 import org.apache.kafka.common.serialization.ByteArraySerializer;
   6 import org.apache.kafka.common.serialization.StringSerializer;
   7 import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
   8 import org.springframework.boot.context.properties.EnableConfigurationProperties;
   9 import org.springframework.context.annotation.Bean;
  10 import org.springframework.context.annotation.Configuration;
  11 import org.springframework.kafka.core.*;
  12 import org.springframework.kafka.listener.DeadLetterPublishingRecoverer;
  13 import org.springframework.kafka.listener.DefaultErrorHandler;
  14 import org.springframework.kafka.support.serializer.DelegatingByTypeSerializer;
  15 import org.springframework.kafka.support.serializer.JsonSerializer;
  16 import org.springframework.util.backoff.FixedBackOff;
  17
  18 import java.util.Map;
  19 import java.util.function.Consumer;
  20
  21
  22 @Configuration
  23 @EnableConfigurationProperties({ KafkaProperties.class, ApplicationProperties.class })
  24 public class ApplicationConfiguration
  25 {
  26   @Bean
  27   public Consumer<ConsumerRecord<String, ClientMessage>> consumer()
  28   {
  29     return (record) ->
  30     {
  31       // Handle record
  32     };
  33   }
  34
  35   @Bean
  36   public ProducerFactory<String, Object> producerFactory(KafkaProperties properties) {
  37     return new DefaultKafkaProducerFactory<>(
  38         properties.getProducer().buildProperties(),
  39         new StringSerializer(),
  40         new DelegatingByTypeSerializer(Map.of(
  41             byte[].class, new ByteArraySerializer(),
  42             ClientMessage.class, new JsonSerializer<>())));
  43   }
  44
  45   @Bean
  46   public KafkaTemplate<String, Object> kafkaTemplate(
  47       ProducerFactory<String, Object> producerFactory) {
  48
  49     return new KafkaTemplate<>(producerFactory);
  50   }
  51
  52   @Bean
  53   public DeadLetterPublishingRecoverer recoverer(
  54       ApplicationProperties properties,
  55       KafkaOperations<?, ?> template)
  56   {
  57     return new DeadLetterPublishingRecoverer(
  58         template,
  59         (record, exception) -> new TopicPartition(properties.getDlqTopic(), record.partition()));
  60   }
  61
  62   @Bean
  63   public DefaultErrorHandler errorHandler(DeadLetterPublishingRecoverer recoverer)
  64   {
  65     return new DefaultErrorHandler(recoverer, new FixedBackOff(0l, 0l));
  66   }
  67
  68   @Bean(destroyMethod = "close")
  69   public org.apache.kafka.clients.consumer.Consumer<String, ClientMessage> kafkaConsumer(ConsumerFactory<String, ClientMessage> factory)
  70   {
  71     return factory.createConsumer();
  72   }
  73 }